\documentclass{standalone}
\usepackage{tikz}
\usepackage{ctex,siunitx}
\setCJKmainfont{Noto Serif CJK SC}
\usepackage{tkz-euclide}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{circuitikz}
\usetikzlibrary{patterns, calc}
\usetikzlibrary {decorations.pathmorphing, decorations.pathreplacing, decorations.shapes,}
\ctikzset{bipoles/length=1cm}
\begin{document}
\small
\begin{circuitikz}[>=latex, yscale=0.8,european]
  % \useasboundingbox(0.9,0)rectangle(5.1,5);
  \draw (0,0)to [battery2] (6,0)--(6,2)to [rmeter, t=V, *-*] (0,2) to [rmeter, t=A] (0,0);
  \draw (0,2)--(0,4)--(2,4) to [pR,name=hb] (4,4)--(4.5,4)to [cute open switch] (6,4)--(6,2);
  \draw (1.5,4) to (1.5,5.0)--(1.5,5.0-|hb.wiper)--(hb.wiper);
  % \draw [->](3,4.7)--(3,4.2);
\end{circuitikz}
\end{document}